Recover and Reuse Concentrated Brines from Advanced Water Treatment Katerina Messologitis University of New Hampshire UNH Thesis Advisor Dr Jim Malley UNH Technical Advisor Elisabeth Vaudevire PWN Technologies NL ID: 935931
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Slide1
Pilot Testing of Electrodialysis Technology: Recover and Reuse Concentrated Brines from Advanced Water Treatment
Katerina MessologitisUniversity of New Hampshire, UNHThesis Advisor: Dr. Jim Malley, UNHTechnical Advisor: Elisabeth Vaudevire, PWN Technologies (NL)
1
Slide2Take-Home Messages2
Successful separation of Cl
-
from SO4
2- and TOC for valuable by-product recovery
Combination of electrodialysis reversals (EDR) and preventative cleaning in place (CIP) preserve membrane performance
Slide3OutlineIntroduction
Electrodialysis Technology Key ObjectivesFeed and Bleed (F&B) PilotTake-Home Messages
3
Slide4Introduction4
Slide5IntroductionSIX® treats 2,000 – 5,000 m
3/h of Ijssel LakeLow molecular weight NOM and nitrate10 – 25 m3/h regeneration brineShort term: deep soil infiltrationLong term: electrodialysis (ED)
5
Brine Type
Na
+
(mg/L)
Cl
-
(mg/L)
SO
4
2-
(mg/L)
HCO
3
-
(mg/L)
NO
3
-
(mg/L)
NOM
(mg/L)
Conductivity
(mS/cm)
Andijk
III
9,000
5,000
5,000
3,000
100
300
25
Pilot
15,000
11,000
7,000
7,000
200
500
45
Slide6PWNT Case Study
6
NaCl Recovery
NaCl, 90 mS/cm
NOM Recovery
Na
2
SO
4
Recovery
Bio-stimulant
Paper/Glass Industry
Slide7Electrodialysis TechnologyIon Selectivity
Current DensityElectrical ResistanceFouling potentialFouling Prevention Methods
7
Slide8Cathode
Anode
Electrodialysis Technology
Transport of ions
across membrane with electricity
Cathode and Anode
Cationic and Anionic Membranes
Selective ED Membranes
8
Cationic
Anionic
Cationic
Anionic
Cationic
NOM
-
NOM
-
NOM
-
NOM
-
Na
+
Na
+
Na
+
Na
+
Cl
-
Cl
-
Cl
-
Cl
-
Cl
-
Cl
-
Cl
-
Cl
-
Na
+
Na
+
Na
+
Na
+
NOM
-
NOM
-
NOM
-
NOM
-
Na
+
Na
+
Na
+
Na
+
Concentrate
Diluate
Electrolyte
Na
+
Cl
-
Na
+
Cl
-
Three streams:
Concentrate – NaCl Recovery
Diluate – SIX
®
Brine
Electrolyte – Sulfamic Acid
Slide9Cathode
Anode
Cathode
Anode
Electrodialysis Technology
Fouling Prevention and Control:
1) Electrodialysis Reversal (EDR)
Flow reversal
Current reversal
9
Cationic
Anionic
Cationic
Anionic
Cationic
NOM
-
NOM
-
NOM
-
NOM
-
Na
+
Na
+
Na
+
Na
+
Cl
-
Cl
-
Cl
-
Cl
-
NOM
-
NOM
-
NOM
-
NOM
-
Na
+
Na
+
Na
+
Na
+
NOM
-
NOM
-
NOM
-
NOM
-
Cl
-
Cl
-
Cl
-
Cl
-
Concentrate
Diluate
Electrolyte
Na
+
Na
+
Na
+
Na
+
Slide10Electrodialysis Technology
Fouling Prevention and Control:2) Chemical Cleaning in Place (CIP)No power appliedAdvantage: removes fouling
Disadvantage: chemical usage
10
Slide11Key Objectives, PWNT Case Study
11
Slide12Key Objectives, PWNT Case Study
12
Slide13Key Objectives, PWNT Case Study
13
Slide14Key Objectives, PWNT Case Study
14
Slide15F&B, Testing of Two Brine QualitiesTarget concentrate conductivity: 90 mS/cm
Target diluate conductivity: 19 mS/cmDiluate: 200 L Brine (SIX® Pilot and Andijk III)Concentrate: 200 L RO waterEDR frequency4-day, 24-hr experimentsWeekly CIPChallenge: Manual EDR
15
Slide16F&B, IEX Pilot Brine16
Concentrate
Diluate
Electrolyte
Raw feed, IEX brine
ED Stack
Raw feed, RO water
Slide17F&B, IEX Pilot Brine17
Concentrate
Diluate
Electrolyte
Raw feed, RO water
Raw feed, IEX brine
ED Stack
60 L bleeds
90
mS
/cm
60 L feeds
Slide18F&B, IEX Pilot Brine18
Concentrate
Diluate
Electrolyte
Raw feed, IEX brine
ED Stack
70
mS
/cm
90
mS
/cm
90
mS
/cm
35 g/L Cl
-
0.4 g/L SO
4
-2
0.03 g/L TOC
70
mS
/cm
0.3 g/L SO
4
-2
0.02 g/L TOC
Raw feed, RO water
Slide19F&B, IEX Pilot Brine19
Concentrate
Diluate
Electrolyte
Raw feed, IEX brine
ED Stack
70
mS
/cm
0.03 g/L SO
4
-2
0.02 g/L TOC
19
mS
/cm
30 L bleed
30 L feed
22
mS
/cm
9 g/L SO4
0.6 g/L TOC
19
mS
/cm
0.1 g/L Cl
-
9 g/L SO
4
-2
0.6 g/L TOC
22
mS
/cm
19
mS
/cm
Raw feed, RO water
90
mS
/cm
35 g/L Cl
-
0.4 g/L SO
4
-2
0.03 g/L TOC
45
mS
/cm
11 g/L Cl
-
7 g/L SO
4
-2
0.5 g/L TOC
Slide20F&B, IEX Pilot Brine
Concentrate conductivity increases with decreasing diluate conductivity
20
Slide21F&B, IEX Pilot Brine21
Trend of current density curves follow diluate conductivity
Slide22F&B, IEX Pilot Brine22
Overall current density is constant
Shorter EDR shows better performance
CIP restores membrane performance
Slide23PWNT Case Study23
NaCl Recovery
NaCl, 90 mS/cm
Slide24F&B, By-Product Recovery Comparison
24
Chloride
mg/L
NOM
mg/L
Sulfate
mg/L
Raw IEX Pilot Brine
11,000
510
7,000
Concentrate Final
36,000
19
600
Ra
w IEX Andijk III Brine
5,000
333
5,000
Concentrate Final
33,000
12
400
Goal of chloride to NOM was met
Goal of chloride to sulfate was met
Pilot
Andijk III
Slide25F&B, Cleaning in Place25
Membrane performance stays constant
Slide26Take-Home Messages26
Successful separation of Cl
-
from SO
42- and TOC for valuable by-product recovery
Combination of electrodialysis reversals (EDR) and preventative cleaning in place (CIP) preserve membrane performance
Slide27Acknowledgements Elisabeth Vaudevire, Technical Advisor (PWNT)
Dr. Jim Malley, Thesis Advisor (UNH)27
Slide28https://forums.somethingawful.com/showthread.php?threadid=3678246
Questions?
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